Yawata, Ichihara, Chiba, Japan Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
October Air Quality Analysis
Yawata, Ichihara, Chiba, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (4th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 58 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 4th Oct - 5th Oct 2025
Yawata, Ichihara, Chiba, Japan
5 AM4th Oct 2025
5 PM
4 AM5th Oct 2025
65AQI
22AQI
60AQI
52AQI
In the last 24 hours,
Yawata's AQI reached its highest point of 65 at 5 AM during the Day, while the lowest point, 22, was recorded at 4 PM during the Day between 4th Oct and 5th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Yawata, Ichihara, Chiba, Japan
25°C23/27°C
26°C23/30°C
27°C24/29°C
28°C26/31°C
28°C26/31°C
28°C27/30°C
27°C24/30°C
25°C24/28°C
27°C24/29°C
28°C27/29°C
27°C25/30°C
27°C25/30°C
28°C26/31°C
28°C23/31°C
22°C20/23°C
25°C22/27°C
26°C22/30°C
23°C21/25°C
23°C20/26°C
23°C20/26°C
24°C21/27°C
26°C23/30°C
24°C22/27°C
25°C23/27°C
26°C23/29°C
24°C22/27°C
21°C19/21°C
22°C19/26°C
23°C21/26°C
23°C22/26°C
--°C/°C
38AQI
36AQI
36AQI
36AQI
2025 Days Vs Air Quality
Yawata, Ichihara, Chiba, Japan
89%
247
11%
30
Total number of days with different AQI categories in last 278 days in 2025 (87 days remaining)
Under WHO’s Safe Air Quality Limits: 89%
Health Risk Level:
Low
In 2025, 89% of 278 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.
Annual Air Quality Insights
Yawata, Ichihara, Chiba, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
32AQI
35AQI
25AQI
29AQI
32AQI
53AQI
30AQI
37AQI
29AQI
30AQI
27AQI
34AQI
28AQI
44AQI
37AQI
35AQI
30AQI
32AQI
58AQI
43AQI
44AQI
39AQI
56AQI
45AQI
42AQI
37AQI
37AQI
39AQI
31AQI
34AQI
28AQI
39AQI
31AQI
45AQI
31AQI
35AQI
30AQI
30AQI
30AQI
30AQI
30AQI
31AQI
34AQI
32AQI
31AQI
30AQI
39AQI
36AQI
32AQI
30AQI
30AQI
30AQI
31AQI
32AQI
32AQI
35AQI
35AQI
39AQI
61AQI
50AQI
69AQI
42AQI
42AQI
26AQI
34AQI
30AQI
33AQI
33AQI
34AQI
39AQI
46AQI
44AQI
41AQI
34AQI
26AQI
23AQI
23AQI
19AQI
22AQI
42AQI
48AQI
58AQI
53AQI
66AQI
81AQI
68AQI
49AQI
37AQI
43AQI
32AQI
29AQI
22AQI
20AQI
21AQI
22AQI
22AQI
30AQI
36AQI
24AQI
45AQI
40AQI
36AQI
27AQI
38AQI
28AQI
32AQI
44AQI
49AQI
63AQI
43AQI
44AQI
40AQI
28AQI
35AQI
36AQI
42AQI
45AQI
38AQI
38AQI
44AQI
39AQI
29AQI
32AQI
37AQI
32AQI
27AQI
24AQI
26AQI
27AQI
20AQI
29AQI
33AQI
35AQI
30AQI
37AQI
39AQI
25AQI
41AQI
42AQI
57AQI
38AQI
40AQI
39AQI
37AQI
31AQI
26AQI
25AQI
23AQI
25AQI
24AQI
17AQI
20AQI
26AQI
30AQI
35AQI
40AQI
44AQI
46AQI
53AQI
38AQI
28AQI
30AQI
39AQI
33AQI
32AQI
36AQI
37AQI
47AQI
43AQI
38AQI
31AQI
28AQI
23AQI
24AQI
21AQI
20AQI
21AQI
36AQI
31AQI
34AQI
40AQI
37AQI
44AQI
40AQI
43AQI
53AQI
72AQI
79AQI
76AQI
70AQI
51AQI
46AQI
52AQI
44AQI
37AQI
35AQI
35AQI
37AQI
34AQI
32AQI
31AQI
31AQI
31AQI
30AQI
34AQI
27AQI
26AQI
25AQI
33AQI
27AQI
30AQI
30AQI
35AQI
42AQI
44AQI
61AQI
49AQI
52AQI
49AQI
47AQI
48AQI
36AQI
37AQI
36AQI
35AQI
41AQI
38AQI
42AQI
39AQI
45AQI
45AQI
47AQI
50AQI
50AQI
49AQI
57AQI
56AQI
54AQI
53AQI
46AQI
53AQI
57AQI
54AQI
43AQI
37AQI
37AQI
40AQI
34AQI
30AQI
30AQI
42AQI
43AQI
39AQI
33AQI
32AQI
31AQI
39AQI
35AQI
30AQI
46AQI
47AQI
35AQI
33AQI
29AQI
28AQI
27AQI
27AQI
31AQI
44AQI
35AQI
30AQI
29AQI
25AQI
39AQI
38AQI
44AQI
58AQI
37AQI
34AQI
42AQI
35AQI
32AQI
33AQI
41AQI
47AQI
35AQI
45AQI
No. of days
202537AQI
Highest AQI recorded in
August47AQI
Lowest AQI recorded in
May32AQI
202437AQI
Highest AQI recorded in
July50AQI
Lowest AQI recorded in
August28AQI
202338AQI
Highest AQI recorded in
December46AQI
Lowest AQI recorded in
August24AQI
202238AQI
Highest AQI recorded in
April42AQI
Lowest AQI recorded in
August19AQI
202141AQI
Highest AQI recorded in
May46AQI
Lowest AQI recorded in
April37AQI
202038AQI
Highest AQI recorded in
August45AQI
Lowest AQI recorded in
April31AQI
Most & Least Polluted Years Over the Last 6 Years
Yawata's annual 2025 AQI (37) shows an average percentage change of -2.2% (improved AQI) compared to previous years: 2020 (38), 2021 (41), 2022 (38), 2023 (38), 2024 (37).